HDHomeRun Playback Failing

[SmplyUnprdctble 6]

This is a weird one, I think?

I have Emby set up in my home with my HDHomeRun for live TV.  Everything works beautifully.

My sister lives in an area where an antenna doesn't get great signal (something-something-mountain).  We have a site-to-site VPN between our houses on our Synology routers (because I'm her tech support), so I decided to set her up an Emby server and connect my HDHomeRun.

I have memories years ago of it working (we know memory is fuzzy, so I accept that the statement isn't trusted).  I was recently told she tried to watch local channels and it just spun.

I finally had a chance to get to her place and look at things.  And, alas, it just spins when I tune into a HDHomeRun channel.

My setup (which works):

ProxMox 9.1.9 server with a Debian  13.4 VM
Passthru NVIDIA 3050
Emby Server 4.9.3.0 running via Docker
Emby Premiere
HDHomeRun CONNECT 4K

My sister's setup 

ProxMox 9.1.9 server with a Debian  13.4 VM
Passthru NVIDIA 3050
Emby Server 4.9.3.0 running via Docker
Emby Premiere
Attempt to connect to my HDHomeRun through a site-to-site VPN (failed)

I'm in her house and I can connect to my home Emby using http://<myLANIP>:8096 from my laptop and I can successfully play my HDHomeRun channels.

However, when I try to play the same channel from her Emby server, it spins and fails.  My HDHomeRun status page shows a tuner connected to that channel.

I thought there might have been some corrupt configuration in her setup, so I spun up a fresh Emby Docker container with the same result.

Initially, all attempts to play were on her Roku TV, but I have since gone to testing things on my laptop with the same results.

Here's what I've tested:

1. Browser on my network
   1. HDHomeRun through my Emby server works
   2. HDHomeRun through my sister's Emby server does not work
   3. Playing channels from my HDHomeRUn via Media Player Classic works
   4. Playing .m3u channels (ersatztv) from my home network to my sister's Emby server works
2. Browser on my sister's network
   1. HDHomeRun through my Emby server works
   2. HDHomeRun through my sister's Emby server does not work
   3. Playing channels from my HDHomeRun via Media Player Classic works (same laptop as above)
   4. Playing .m3u channels (ersatztv) from my home network to my sister's Emby server works

Do you have any ideas why HDHomeRun isn't working with only my sister's Emby?

embyserver (1).txt hardware_detection-63914662121.txt